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I have a lua dissector that works just fine in 4.05 but in 4.07 it does not work. I get a range nil in the lua console window. I tracked it down to dissect_tcp_pdus. It does not call my get_len_func or dissect_func. Does anyone know if there was some breaking changed between the two version?

function cac_protocol.dissector(buffer, pinfo, tree)
  length = buffer:len()

  pinfo.cols.protocol = cac_protocol.name

  if length == 0 then
    return
  end

  local subtree = tree:add(cac_protocol, buffer(), "CAC Protocol Data")

--I get here
 print("dissect_tcp_pdus:"  )

 dissect_tcp_pdus(buffer, subtree, 4, get_pdu_len, do_dissection)

end

function get_pdu_len(tvb, pinfo, tree)
  --I dont get here
  print("get_pdu_len:")
  return tvb(0, 4):int() *4
end

function do_dissection(tvb, pinfo, tree)
  --I dont get here
  print("do_dissection:")
   --CODE Removed
end